Last updated: August 23, 2025
In December, the average temperature in Tornio, Finland hovers around -4°C (25°F). Be prepared for chilly days, as temperatures can dip as low as -19°C (-2°F) and peak at a mild 4°C (40°F). During this month, expect 73 mm (2.9 in) of precipitation spread over 16 days, contributing to an impressive average humidity of 98%. Stay warm and dry!
In December in Tornio, the average temperature is -4°C (25°F). Maximums can reach 4°C (40°F) while minimums can drop as low as -19°C (-2°F). Be sure to pack warm clothing and prepare for cold weather conditions during your travels.
In Tornio in December, the precipitation amount is 73 mm (2.9 in) spread over 16 days.
In Tornio in December humidity is 98%. With an average temperature of -4°C (25°F), this humidity feels like a biting chill that clings to your skin, making every step feel more laborious as you navigate through the frosty air, dampening your spirits as well as your clothes.
In Tornio in December, the maximum UV index is 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the Hourly UV Index in Tornio.
UV Risk Categories
Weather in Tornio varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Tornio, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (18°F) | 51 mm (2.0 inches) | 99% | low |
| February Weather | -8°C (17°F) | 48 mm (1.9 inches) | 97% | low |
| March Weather | -5°C (24°F) | 48 mm (1.9 inches) | 93% | low |
| April Weather | -1°C (31°F) | 37 mm (1.4 inches) | 86% | moderate |
| May Weather | 5°C (42°F) | 52 mm (2.0 inches) | 80% | moderate |
| June Weather | 13°C (55°F) | 58 mm (2.3 inches) | 76% | high |
| July Weather | 17°C (62°F) | 61 mm (2.4 inches) | 79% | high |
| August Weather | 15°C (59°F) | 91 mm (3.6 inches) | 83% | moderate |
| September Weather | 10°C (51°F) | 87 mm (3.4 inches) | 89% | moderate |
| October Weather | 4°C (40°F) | 109 mm (4.3 inches) | 94% | low |
| November Weather | 0°C (32°F) | 82 mm (3.2 inches) | 94% | low |
| December Weather | -4°C (25°F) | 73 mm (2.9 inches) | 98% | low |